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Dynamic Creep Buckling: Analysis of Shell Structures Subjected to Time-dependent Mechanical and Thermal LoadingThe objective of the present research is to develop a general mathematical model and solution methodologies for analyzing the structural response of thin, metallic shell structures under large transient, cyclic, or static thermomechanical loads. Among the system responses associated with these loads and conditions are thermal buckling, creep buckling, and ratcheting. Thus geometric and material nonlinearities (of high order) can be anticipated and must be considered in developing the mathematical model. A complete, true ab-initio rate theory of kinematics and kinetics for continuum and curved thin structures, without any restriction on the magnitude of the strains or the deformations, was formulated. The time dependence and large strain behavior are incorporated through the introduction of the time rates of metric and curvature in two coordinate systems: fixed (spatial) and convected (material). The relations between the time derivative and the covariant derivative (gradient) were developed for curved space and motion, so the velocity components supply the connection between the equations of motion and the time rates of change of the metric and curvature tensors.
Document ID
19850019647
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Simitses, G. J.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Carlson, R. L.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Riff, R.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1985
Publication Information
Publication: NASA. Lewis Research Center Struct. Integrity and Durability of Reusable Space Propulsion Systems
Subject Category
Structural Mechanics
Accession Number
85N27959
Funding Number(s)
CONTRACT_GRANT: NAG3-534
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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